An emissary of the Islamic Army of Aden (IAA), a Yemeni-based al-Qaeda affiliate, visits Finsbury Park mosque in London, according to an unnamed intelligence service. The mosque is run by Abu Hamza al-Masri, a leading radical and informer for the British security services (see Early 1997). According to authors Sean O’Niell and Daniel McGrory, the emissary is “greeted like a hero” by Abu Hamza, addresses worshippers at the mosque, distributes leaflets, and collects money, presumably for jihad in Yemen. Abu Hamza and the IAA are co-operating closely at this time (see (June 1998)). The intelligence service, possibly the CIA or a local Yemeni service working with it, learns of this visit around the time it is made, and the visit is one reason it finds the London connection is “crucial” to the IAA (see After August 7, 1998). [O’Neill and McGrory, 2006, pp. 164]